320 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



outgrowth which, in conjunction with the dactylos, forms 

 a pincer. In other words, the walking logs terminate in 

 a single claw, and are not chelate. 



The three terminal segments are capable of being 

 flexed upon the proximal segments. This flexion is in a 

 vertical plane. 



Pleopods (Female) (PL II, fig. 17). There are four 

 pairs of appendages on the female abdomen, one pair 

 being situated on each of the second, third, fourth and 

 fifth somites respectively. They are all similar in 

 structure. Each pleopod is attached to the abdomen by 

 a basal piece — the protopodite (prot.). From this arise 

 two long pieces — an outer exopodite [ex.) and an inner 

 endopodite [end.). The exopodite is almost cylindrical 

 in section, and about half as long as the abdomen. 



From the outer and inner edges of the exopodite 

 rows of setae arise. Each seta has short fine branches 

 given off from each side of the central stem. The endo- 

 podite is about as long as the exopodite. About one-third 

 of its length from the base is a well-defined transverse 

 groove. The setae are arranged, as in the exopodite, 

 along the outer and inner edges, but they arise in small 

 bundles. The setae are very long and do not bear off- 

 shoots except near the tip, where there are a few very 

 fine short branches. The eggs are attached to the 

 endopoditic setae. 



Pleopods (Male) (PL II, figs. 14, 15, 16). There are 

 two pairs of abdominal appendages in the male, which are 

 situated on the first two somites. Both pairs are greatly 

 modified and act as copulatory organs (see section on 

 Reproductive Organs). 



First pair (PL II, fig. 14). Each consists of two 

 parts — a broad basal portion, probably the protopodite 

 (prot.), and an elongated distal portion, which is rolled 



